NEED ADVICEEEE ASAPPPP

I had my period January 8-12. Around the 14 or 15th I had sex and he came inside me. But he said there wasn't much chance of me getting pregnant because I was just on my period. (Is this true ?) During my ovulation stage eve said I had a 33% chance of getting pregnant. I had sex and he came inside again (by accident) the 21st was the day and I took a plan B. It said it could make your period up to a week late. But I'm 18,neverous, and still have a future I want to succeed in. It is Now Feb. 7 and my period is 3 days late. I'm inexperienced and unfamiliar with this stuff. Should I be worried? PLEASE HELP WITH ADVICE! I Need iT!!!
(No im not on any form of birth control)

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